Nathaniel Grace Lambert JP DL (1811 – 9 December 1882) was an English mine-owner and Liberal Party politician who sat in the House of Commons from 1868 to 1880.

Lambert was the son of Richard Lambert of Newcastle upon Tyne and his wife Achsah Grace, daughter of Nathaniel Grace. He was educated privately and became a mine-owner. He was captain-commandant of the Taplow Yeomanry Lancers^[1] and a J.P. and deputy lieutenant for Buckinghamshire. In 1865 he was High Sheriff of Buckinghamshire.^[2]

At the 1868 general election Lambert was elected as a Member of Parliament (MP) for Buckinghamshire. He held the seat until 1880.^[3]

Lambert died at the age of 71.

Lambert married Mary Ann Richards, daughter of Thomas Wright Richards of Rushden, Northamptonshire, in 1843.^[2]

Their youngest daughter, Christina, married Lord John Hay in 1876.^[4]